Good translation Metal Products (Shanghai) alloy structural steel companies (domestic alloy steel / alloy steel imports) 30CrMo alloy steel / 30CrMo steel / 30CrMo steel bar / 30CrMo steel coil / 30CrMo steel / 30CrMo steel / 30CrMo steel (good Translation Metal Products (Shanghai) Co., Ltd.) 
 30CrMo, alloy structural steel. Unified digital code: A30302 
 Chemical composition 
 (Wt) (%) 
 C: 0.26 ~ 0.34 
 Si: 0.17 ~ 0.37 
 Mn: 0.40 ~ 0.70 
 Cr: 0.80 ~ 1.10 
 Mo: 0.15 ~ 0.25 
 P: ≤ 0.035 
 S: ≤ 0.035 
 Ni: ≤ 0.030 
 Cu: ≤ 0.030 
 Mechanical properties 
 Blank sample size (mm): 25 
 Heat treatment: 
 The first quenching temperature (℃): 880; coolant: water, oil 
 Second quenching temperature (℃): - 
 Tempering heating temperature (℃): 540; coolant: water, oil 
 Tensile strength (σb / MPa): ≧ 930 
 Yield point (σs / MPa): ≧ 785 
 Elongation (δ5 /%): ≧ 12 
 Reduction of (ψ /%): ≧ 50 
 Impact absorbed energy (Aku2 / J): ≧ 63 
 Brinell hardness (HBS100/3000) (annealing or tempering condition): ≦ 229 
 30crmo heat treatment 
 Annealing annealing No.1 "760 ± 10 ℃ annealing, furnace cooling to 400 ℃ air-cooled. 
 HB220-230 
 Normalizing normalize No.4 860 ± 10 ℃ normalizing, baked cooled. 
 Quenching quenching + tempering No.5 840 ± 10 ℃ quenching water or oil (depending on the product shape complexity) ,680-700 degree tempered. HB <217 
 Quenching quenching + tempering No.6 840 ± 10 ℃ quenching oil, 470 degrees and then tempered. HRC41-45 
 Quenching quenching + tempering No.7 840 ± 10 ℃ quenching oil, 480 degrees and then tempered. HRC35-45 
 Quenching quenching + tempering No.8 850 ℃ quenching oil, 510 degrees and then tempered. HRC38-42 
 Quenching quenching + tempering No.9 850 ℃ quenching oil, then tempered to 500 degrees. HRC40-43 
 Quenching quenching + tempering No.10 850 ℃ quenching oil, and then 510 ℃ tempering. HRC36-42 
 Quenching quenching + tempering No.11 850 ℃ quenching oil, and then 560 ℃ tempering. HRC32-36 
 Quenching quenching + tempering No.12 860 ℃ quenching oil, 390 degrees and then tempered. HRC48-52 
 Key Features 
 This steel has high strength and toughness, high hardenability, quenching in oil, the critical diameter of 15 ~ 70mm; hot strength of steel is also good, at below 500 ℃ with sufficient high temperature strength, but when its 550 ℃ intensity decreased significantly; when welding alloy elements in the next limit is quite good, but close to the upper limit of welding medium and preheated before welding to be more than 175 ℃; steel cutting can be good, cold plastic deformation of the middle; heat treatment in the range of 300 ~ 350 ℃ have first temper brittleness; have a tendency to the formation of white spots. 
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